Did you watch Law & Order:SVU this week? Part of the plot involved Mormon nannies. A character in the show said they're the best nannies because they "come from large families, don't smoke, and speak English."
It was obvious that the show's writers did their homework, because the first words out of the mouth of the first nanny the detectives interviewed were "Oh my heck!" The phrase "Relief Society" was also thrown in. However, one of the nannies said she was doing the job while her fiance was on his mission in Peru. I didn't think missionaries normally got engaged before departing, but what do I know?
Anyway, it doesn't look like they were lying about the popularity of Mormon nannies. This company has a whole division of LDS nannies. Also, this company has advertised in the local paper here. It recruits in the Rocky Mountain area to find nannies to work in New York, New Jersey, and Connecticut.
On a side note, SVU has taken heed of my warning and laid off the liberal politics in recent episodes, much to my delight.